Electric power of a circuit is the rate at which work is done in maintaining the electric current in the circuit.

How are ammeters and voltmeters connected in a circuit? What do they help us measure?

What will happen to the resistance of the circuit,if the current through it is doubled?

$A$ hot plate of an electric oven connected to a $220 \ V$ line has two resistors $A$ and $B$ each of $22 \ \Omega$ resistance. These resistors may be used separately,in series,or in parallel. Find the current flowing in all the three cases.

What is the device (meter) used to measure electric potential difference called?

Tungsten is used almost exclusively for filaments of electric bulbs. List two reasons.